kubernetes scale_int_test 源码
kubernetes scale_int_test 代码
文件路径：/staging/src/k8s.io/apimachinery/pkg/api/resource/scale_int_test.go
/*
Copyright 2015 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package resource
import (
"math"
"math/big"
"testing"
)
func TestScaledValueInternal(t *testing.T) {
tests := []struct {
unscaled *big.Int
scale int
newScale int
want int64
}{
// remain scale
{big.NewInt(1000), 0, 0, 1000},
// scale down
{big.NewInt(1000), 0, -3, 1},
{big.NewInt(1000), 3, 0, 1},
{big.NewInt(0), 3, 0, 0},
// always round up
{big.NewInt(999), 3, 0, 1},
{big.NewInt(500), 3, 0, 1},
{big.NewInt(499), 3, 0, 1},
{big.NewInt(1), 3, 0, 1},
// large scaled value does not lose precision
{big.NewInt(0).Sub(maxInt64, bigOne), 1, 0, (math.MaxInt64-1)/10 + 1},
// large intermediate result.
{big.NewInt(1).Exp(big.NewInt(10), big.NewInt(100), nil), 100, 0, 1},
// scale up
{big.NewInt(0), 0, 3, 0},
{big.NewInt(1), 0, 3, 1000},
{big.NewInt(1), -3, 0, 1000},
{big.NewInt(1000), -3, 2, 100000000},
{big.NewInt(0).Div(big.NewInt(math.MaxInt64), bigThousand), 0, 3,
(math.MaxInt64 / 1000) * 1000},
}
for i, tt := range tests {
old := (&big.Int{}).Set(tt.unscaled)
got := scaledValue(tt.unscaled, tt.scale, tt.newScale)
if got != tt.want {
t.Errorf("#%d: got = %v, want %v", i, got, tt.want)
}
if tt.unscaled.Cmp(old) != 0 {
t.Errorf("#%d: unscaled = %v, want %v", i, tt.unscaled, old)
}
}
}
func BenchmarkScaledValueSmall(b *testing.B) {
s := big.NewInt(1000)
for i := 0; i < b.N; i++ {
scaledValue(s, 3, 0)
}
}
func BenchmarkScaledValueLarge(b *testing.B) {
s := big.NewInt(math.MaxInt64)
s.Mul(s, big.NewInt(1000))
for i := 0; i < b.N; i++ {
scaledValue(s, 10, 0)
}
}
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